Abstract: A new liquid phase diesel hydrogenation unit with capacity of 0.60 Mt/a was built in CNOOC Oriental Petrochemical Co. Ltd., using atmospheric gas oil and lighe cycle oil from catalytic cracking unit as raw materials to produce diesel meeting China phase Ⅴ standard . The plant started to produce qualified products for the first time in January 2017 and has run smoothly since then. Due to the changes of the proportion of feed oils, the operation conditions had to switch at any time according to six working conditions, resulting in high energy consumption. By analyzing the different processing conditions and the problems affecting the long cycle operation, some solutions were suggested, which can provide reference for the operation of the same type of plant.

Key words: diesel, liquid phase hydrogenation, energy consumption, operating condition, filter